Question

A force of 4 newton acts on a body of mass 40 kg for a distance of 2 minutes what is the kinetic energy

Answer 1

kinetic energy=1/2mv2
=1/2×40×{2} 2
80 ..... is your answer

Answer 2

The kinetic energy of the body is 2880 J.

Explanation:

Given that,

Force, F = 4 N

Mass of the body, m = 40 kg

Time, t = 2 min = 120 s

To find,

Kinetic energy of the body.

Solution,

Force acting on a body is given by :

F = ma

$a=\dfrac{F}{m}$

$a=\dfrac{4}{40}$

$a=0.1\ m/s^2$

Initially, the body was at rest, u = 0

Let v is the final velocity of the body. It can be given by :

$v=u+at$

$v=0.1\times 120$

v = 12 m/s

Kinetic energy of a body is given by :

$K=\dfrac{1}{2}mv^2$

$K=\dfrac{1}{2}\times 40\times (12)^2$

K = 2880 J

So, the kinetic energy of the body is 2880 J.

Learn more,

Kinetic energy

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